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Database-Marketing Calculator

Calculating the Required Sample-Size

Expected Response Rate of Test-Group
(i.e.: 2.5)
Allowed Percentage Error (i.e.: 0.20)
Confidence Level: 80%
The required sample-size is:
The confidence range for the response-rate is between: to

System Message:

When you want to test a new design of a direct mailing or simply change your offer, you may want to test this not on the total customer file but on a small selection. Large enough to give you correct answers, but certainly small enough to provide information on which you can rely.

In this case you should calculate the appropriate sample-size by using this calculator. It will tell you how big your sample should be so that you can draw the right conclusions out of it.

Attention !
These calculators are provided as is (mainly to demonstrate the techniques and tools of Database-Marketing) and we do not accept any responsibility for incorrect results. Although we have designed each of them with all of our experience - if you rely on the results you do so at your own risk.

And a technical note:
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